Andrew, if you are ready to let go, it's okay. You know what you want best.

A few comments:
- Counseling for the kids is a great idea.
- Meditation and working out--also great.
- Moms, family members, friends, they all will say that you did your best and to let go. They have the best intentions, but subconsciously, want to feel better themselves. They are suffering bc you're suffering, and think the best way to stop it is through D.
-DB is also about GALing and reclaiming your independence even if your M doesn't work out. Keep at it.
-Let her do whatever she wants to do, GAL, take care of yourself and the kids. This is DBing, and things might change before D papers are filed. Ask yourself what you would do if she changed her mind--that's a really tough one, esp after an A. After I found out about my H's A, I felt I didn't want to be married for 6 long months. Then, with time, I felt differently. Too bad he lost his desire to work on the M at about the same time...
Hang in there. Keep posting. Hope I can help.